Radio receiving system



July 5,1927.

' 7 1,634,962 R. SACHTLEBER v RADIO RECEIVING SYSTEM Filed Sept. 22. 1924 2 sheets-sheet 1 INVENTOR flJwzz ezer,

ATTORNEY July 5,1927. 1,634,962

R. SACHTLEBER v RADIO RECEIVING SYSTEM Filed Sept. 1924 2 Sheets-Sheet 2 .\Q o N N 0) 9 m 1 I A .k I L L &

, w o Il- "l @3 lLJach Z-Zeh O Patented July 5, 1927.

UNITED STATES RUDOLPH SACHTLEBEB, OF BROOKLYN, NEW YORK.

RADIO RECEIVING, SYSTEM.

Application filed September-22,1924. Serial No. 738,967.

paratus to be constructed in a compact self containedunit for convenient operation and reception of radio broadcast entertainment in thehom'e.

Still another object of my invention is to provide an electron tube circuit arrangement for radio receiving apparatus which will maintain a' condition of stability without oscillation but secure amplification througl the principle of regeneration.

A further object of the invention is to provide a radio frequency collecting system for the broadcast energy consisting of'a pair of loops positioned adjacent each other and connected in parallel with the input and output circuits of an electron tube forming part of a radio receiving system and arranged in such manner that oscillations will be prevented while a large increase in the amplitude of. the received energy may be secured by regeneration below the point of oscillation. i A still further object of the invention is to provide a construction of radio frequency energyqcollecting system wherein a, pair of loop antennae is provided with one of the said loops having its turns wound immediately adjacent the turns of the other loop for a portion of its length with the loops connected across the input and output cir- 40 cuits of an electron tube arranged to rectify the incoming signaling energy for delivering the energy to a responsive device.

Other and further objects of the invention reside in the construction and arrangement ofparts of the radio frequency energy collecting means and the electron tube cirouit arrangements employed at the receiver and will be understood from the specification hereinafter following by reference to the accompanyingdrawings in which:

Figure 1 is a diagrammatic view showing the arrangement of the radio frequency energy collecting means and the electrical connection thereof in an electron tube circuit at the radio receiver; Fig. 2 shows theapplication of the'apparatus of my invention to a complete radio receiving system constructed to operate a loud speaker; Fig. 3 is a side elevation showing the arrangement'of the radio frequency energy collecting means which Iemploy in my radio receiving system; Fig. 4 is an end view of the radio receiving energy collecting means illustrated in Figure 3; and Fig. 5 is an enlarged view showing the arrangement of the pair of radio frequency energy collecting loops which I employ in the radio receiving apparatus.

Heretofore in the art radio receivers have been relatively complicated in construction and diflicult for operation by the novice or one unskilled in the electrical art. This has been due largely to the number of controls necessary to operate the receiver and the requirement of providing specially arranged inductances, capacities and resistances for neutralizing inherent tube capacity. By my present invention I provide a compact circuit arrangement wherein the inherent tube capacity is substantially balanced by the provision of parallel connected radio frequency energy collecting loops in the input and output circuits of the tube. The inductances serve to electrically tune the receiving circuit to resonance with the incoming signaling frequency at the same time, that they serve to impress an operating electromotive force upon the tube and maintain the tube circuit in a condition of regenera tion .without oscillation.v The inductances are arranged immediately adjacent each other upon a frame support with one of the inductances extending only throughout a portion of the length of the other of the inductances. By this arrangement of inductances forming the radio frequency energy collecting means I am enabled to secure extremely sensitive and selective operation of the radio receiving apparatus.

Referring more particularly to the drawings reference character 1 designates an electron tube arranged at a receiving station and containing cathode2 'control electrode 3 and anode 4. The cathode 2 is heated by battery *5, the heating current being controlled by rheostat 6 and switch 7 Battery 8 supplies high potential to anode 4 inthe. output circuit which includes the responsive device 9. The input circuit'of the tube 1 across the control electrode 3 and hot cathode 2 is ters Patent of the United States is as follows Radio receiving apparatus comprising in combination an electron tube having grid, filament and plate electrodes, an input circuit including said grid and filament electrodes, an output including said plate and filament electrodes, and a pairof radio frequency energy collecting loops superimposed upon each other and connected directly across said input and output circuits, one of said loops having a conductor; of greater length than the conductor forming the other of said loops, said conductors being positioned immediately adjacent each other throughout the length of said shorter conductor and arranged to regeneratively amplify incoming signaling energy below the point of oscillation, said-conductors having adjacent ends thereof connected electrostati- 20 cally.

In testimony whereof I aflix my signature.

7 RUDOLPH SACHTLEBER. 

